linux-kernel - Re: [PATCH 2/2] Bluetooth: Replaces printk with pr_debug in bt

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Message-ID: <2023110752-headset-gains-41a7@gregkh>
Date:   Tue, 7 Nov 2023 07:31:27 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Yuran Pereira <yuran.pereira@...mail.com>
Cc:     linux-bluetooth@...r.kernel.org, johan.hedberg@...il.com,
        marcel@...tmann.org, linux-kernel@...r.kernel.org,
        luiz.dentz@...il.com,
        linux-kernel-mentees@...ts.linuxfoundation.org
Subject: Re: [PATCH 2/2] Bluetooth: Replaces printk with pr_debug in bt_dbg

On Tue, Nov 07, 2023 at 03:56:08AM +0530, Yuran Pereira wrote:
> bt_dbg() uses printk, as opposed to other functions in this file
> which use pr_* family of logging functions.
> 
> This patch changes that by replacing `printk(KERN_DEBUG` with
> the equivalent pr_debug() call which makes the overall file
> look more uniform and cleaner.
> 
> Signed-off-by: Yuran Pereira <yuran.pereira@...mail.com>
> ---
>  net/bluetooth/lib.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/net/bluetooth/lib.c b/net/bluetooth/lib.c
> index 063032fe9c68..96ba39f8b461 100644
> --- a/net/bluetooth/lib.c
> +++ b/net/bluetooth/lib.c
> @@ -329,7 +329,7 @@ void bt_dbg(const char *format, ...)
>  	vaf.fmt = format;
>  	vaf.va = &args;
>  
> -	printk(KERN_DEBUG pr_fmt("%pV"), &vaf);
> +	pr_debug("%pV", &vaf);

You might have just changed the functionality here, are you SURE this is
identical to the original code?  How was it tested?

I'm not saying this is a bad idea to do, just be aware of the
consequences for this change and document it properly (hint, the
changelog does not document the user-visible change that just happened.)

Note, pr_debug() is NOT identical to printk(), look at the source for
the full details.

thanks,

greg k-h